Numbers k such that usigma(uphi(k)) = k where usigma is the sum of unitary divisors of k (A034448) and uphi is the unitary totient function (A047994).

A329856

Numbers k such that usigma(uphi(k)) = k where usigma is the sum of unitary divisors of k (A034448) and uphi is the unitary totient function (A047994).

Terms

    a(0) =1a(1) =3a(2) =4a(3) =5a(4) =8a(5) =9a(6) =12a(7) =17a(8) =20a(9) =24a(10) =32a(11) =36a(12) =40a(13) =68a(14) =72a(15) =96a(16) =128a(17) =136a(18) =160a(19) =257a(20) =288a(21) =384a(22) =544a(23) =640a(24) =1028a(25) =1152a(26) =2056a(27) =2176a(28) =8192a(29) =8224

External references